The Browser Defense Playbook

The Browser Defense Playbook: Stopping the Attacks That Start on Your Screen unit42.paloaltonetworks.com/browser-d… Cloud-based applications and the shift to remote work have made the browser the primary workspace for most employees — with roughly eighty-five per cent of daily activity now occurring inside the browser. This model delivers clear advantages. Users gain flexibility to work across locations and devices, often accessing full virtual desktops through a single tab. Organizations benefit from centralized management, reduced costs and simplified administration compared to traditional local software. Attackers have followed this shift. According to Unit 42’s 2025 Global Incident Response Report, nearly half of investigated incidents involved malicious activity launched or facilitated through browser sessions. Common tactics include phishing, URL redirect abuse and malware downloads that exploit weaknesses in browser controls and visibility. The blog outlines why securing the browser is becoming a strategic priority and offers guidance for mitigating these risks.